Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published November 2018 | Supplemental Material + Published
Journal Article Open

Modulated Resonant Transmission of Graphene Plasmons Across a λ/50 Plasmonic Waveguide Gap


We theoretically demonstrate the nontrivial transmission properties of a graphene-insulator-metal waveguide segment of deeply subwavelength scale. We show that, at midinfrared frequencies, the graphene-covered segment allows for the resonant transmission through the graphene-plasmon modes as well as the nonresonant transmission through background modes, and that these two pathways can lead to a strong Fano interference effect. The Fano interference enables a strong modulation of the overall optical transmission with a very small change in graphene Fermi level. By engineering the waveguide junction, it is possible that the two transmission pathways perfectly cancel each other out, resulting in a zero transmittance. We theoretically demonstrate the transmission modulation from 0% to 25% at 7.5-µm wavelength by shifting the Fermi level of graphene by a mere 15 meV. In addition, the active region of the device is more than 50 times shorter than the free-space wavelength. Thus, the reported phenomenon is of great advantage to the development of on-chip plasmonic devices.

Additional Information

© 2018 American Physical Society. Received 7 June 2018; revised manuscript received 7 September 2018; published 26 November 2018. The authors acknowledge support from the National Research Foundation of Korea (NRF) (Grant No. 2017R1E1A1A01074323, M.S.J.) and KAIST Global Center for Open Research with Enterprise (GCORE) (Grant No. N11180017, S.G.M.) funded by the Ministry of Science and ICT, and Basic Science Research Program through NRF funded by the Ministry of Education (Grant No. 2017R1D1A1B03034762, M.S.J). M.S.J., V.W.B., and H.A.A. acknowledge support from the Air Force Office of Scientific Research through Grant No. FA9550-16-1-0019. V.W.B. thanks the Wisconsin Alumni Research Foundation for support. M.S.J., and S.K. contributed equally to this work.

Attached Files

Published - PhysRevApplied.10.054053.pdf

Supplemental Material - _FINAL_Supplemental_Material_final_181102.pdf


Files (1.7 MB)
Name Size Download all
1.1 MB Preview Download
507.4 kB Preview Download

Additional details

August 19, 2023
October 19, 2023